I’m not aware of many Japanese prison guards who moved to the U.S. after the war. On the other hand, the U.S. deliberately let thousands of Nazi collaborators settle in this country, thinking they would be helpful as spies and informants (and of course as scientists) against the Soviet Union. It was only in the late 1970s that the public became aware of this, and the government began rooting out some of these former concentration camp guards.
I think many of the scientists from the Axis countries were very different people from concentration camp guards. If not for the Cold War, we probably would have been more harsh with the scientists as well; the reality was that the fall of Berlin just started another phase of warfare.
Concentration camp guards had little use to anyone; I doubt we knowingly gave sanctuary to any of them.